[PATCH 5.10 245/509] usb: common: usb-conn-gpio: Set last role to unknown before initial detection

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From: Prashanth K <quic_prashk@xxxxxxxxxxx>

[ Upstream commit edd60d24bd858cef165274e4cd6cab43bdc58d15 ]

Currently if we bootup a device without cable connected, then
usb-conn-gpio won't call set_role() since last_role is same as
current role. This happens because during probe last_role gets
initialised to zero.

To avoid this, added a new constant in enum usb_role, last_role
is set to USB_ROLE_UNKNOWN before performing initial detection.

While at it, also handle default case for the usb_role switch
in cdns3, intel-xhci-usb-role-switch & musb/jz4740 to avoid
build warnings.

Fixes: 4602f3bff266 ("usb: common: add USB GPIO based connection detection driver")
Signed-off-by: Prashanth K <quic_prashk@xxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Message-ID: <1685544074-17337-1-git-send-email-quic_prashk@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/usb/cdns3/core.c                       | 2 ++
 drivers/usb/common/usb-conn-gpio.c             | 3 +++
 drivers/usb/musb/jz4740.c                      | 2 ++
 drivers/usb/roles/intel-xhci-usb-role-switch.c | 2 ++
 include/linux/usb/role.h                       | 1 +
 5 files changed, 10 insertions(+)

diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
index 8fe7420de033d..e5fe640b2bb01 100644
--- a/drivers/usb/cdns3/core.c
+++ b/drivers/usb/cdns3/core.c
@@ -243,6 +243,8 @@ static enum usb_role cdns3_hw_role_state_machine(struct cdns3 *cdns)
 		if (!vbus)
 			role = USB_ROLE_NONE;
 		break;
+	default:
+		break;
 	}
 
 	dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);
diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
index c9545a4eff664..5754e467c16a8 100644
--- a/drivers/usb/common/usb-conn-gpio.c
+++ b/drivers/usb/common/usb-conn-gpio.c
@@ -276,6 +276,9 @@ static int usb_conn_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, info);
 
+	/* Set last role to unknown before performing the initial detection */
+	info->last_role = USB_ROLE_UNKNOWN;
+
 	/* Perform initial detection */
 	usb_conn_queue_dwork(info, 0);
 
diff --git a/drivers/usb/musb/jz4740.c b/drivers/usb/musb/jz4740.c
index c4fe1f4cd17a3..f283629091ec4 100644
--- a/drivers/usb/musb/jz4740.c
+++ b/drivers/usb/musb/jz4740.c
@@ -91,6 +91,8 @@ static int jz4740_musb_role_switch_set(struct usb_role_switch *sw,
 	case USB_ROLE_HOST:
 		atomic_notifier_call_chain(&phy->notifier, USB_EVENT_ID, phy);
 		break;
+	default:
+		break;
 	}
 
 	return 0;
diff --git a/drivers/usb/roles/intel-xhci-usb-role-switch.c b/drivers/usb/roles/intel-xhci-usb-role-switch.c
index 5c96e929acea0..4d6a3dd06e011 100644
--- a/drivers/usb/roles/intel-xhci-usb-role-switch.c
+++ b/drivers/usb/roles/intel-xhci-usb-role-switch.c
@@ -97,6 +97,8 @@ static int intel_xhci_usb_set_role(struct usb_role_switch *sw,
 		val |= SW_VBUS_VALID;
 		drd_config = DRD_CONFIG_STATIC_DEVICE;
 		break;
+	default:
+		break;
 	}
 	val |= SW_IDPIN_EN;
 	if (data->enable_sw_switch) {
diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h
index b9ccaeb8a4aef..aecfce46d3544 100644
--- a/include/linux/usb/role.h
+++ b/include/linux/usb/role.h
@@ -11,6 +11,7 @@ enum usb_role {
 	USB_ROLE_NONE,
 	USB_ROLE_HOST,
 	USB_ROLE_DEVICE,
+	USB_ROLE_UNKNOWN,
 };
 
 typedef int (*usb_role_switch_set_t)(struct usb_role_switch *sw,
-- 
2.39.2






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